I think it is useful for many users of old vehicles (especially campers) the possibility of customizing the intermediate values of the sensor resistance (useful for immersion sensors that cannot be replaced with floats)
Example:
200Ω=empty
200Ω+xΩ = 150Ω = 30% = 40 lt/gallon/%
200Ω+xΩ+yΩ = 70Ω = 64% = 70 lt/gallon/%
200Ω+xΩ+yΩ+zΩ = 36Ω = 98% = 120 lt/gallon/%